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====== Number Of Permutations ======
==== Problem ====
Given finite set $X$ with $n$ elements, how many permutations are there of $X$?
  - Show that if $X=\{1\}$, then there is only one permutation of $X$.
  - Show that if $X=\{1,2\}$, then there are two permutations of $X$. List them.
  - Make a list of all permutations of $X=\{1,2,3\}$, and then of $X=\{1,2,3,4\}$. What pattern do you see?
  - Make a conjecture about the number of permutation of $X$ if $|X|=n$. Then prove your conjecture.

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==== Remarks ====  
  * Make remarks with a list.

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==== $\LaTeX$ version ====
<file tex problem.number_of_permutations.tex>
%%%%%
% DEPENDENCIES
% RequiredPackages: \usepackage{tikz}
% RequiredMacros: \DeclareMathOperator{\aut}{Aut} 
%%%%%
\begin{problem}
Given finite set $X$ with $n$ elements, how many permutations are there of $X$?
\begin{enumerate}
Show that if $X=\{1\}$, then there is only one permutation of $X$.
\item Show that if $X=\{1,2\}$, then there are two permutations of $X$. List them.
\item Make a list of all permutations of $X=\{1,2,3\}$, and then of $X=\{1,2,3,4\}$. What pattern do you see?
\item Make a conjecture about the number of permutation of $X$ if $|X|=n$. Then prove your conjecture.
\end{problem}
</file>

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==== External links ====
  * [[wp>Dihedral group]]

{{tag>problem ben}}

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